diff --git a/anki/collection.py b/anki/collection.py
index 9da119e4d..57da0d2fb 100644
--- a/anki/collection.py
+++ b/anki/collection.py
@@ -198,6 +198,7 @@ crt=?, mod=?, scm=?, dty=?, usn=?, ls=?, conf=?""",
         tbls = "notes", "cards", "revlog", "graves"
         for t in tbls:
             self.db.execute("update %s set usn=0 where usn=-1" % t)
+        self._usn += 1
         self.models.beforeUpload()
         self.tags.beforeUpload()
         self.decks.beforeUpload()